Pemeran Twinkling Watermelon

Ryeo Un (려운)

as Ha Eun Gyeol

Pemeran Utama

Choi Hyun Wook (최현욱)

as Ha I Chan

Pemeran Utama

Seor In A (설인아)

as Choi Se Gyeong | On Eun Yu

Pemeran Utama

Shin Eun Soo (신은수)

as Yun Cheong A

Pemeran Utama

Bong Jae Hyun

as Ha Eun Ho [Eun Gyeol’s brother]

Pemeran Pembantu

Choi Won Young (최원영)

as Ha I Chan [Older]

Pemeran Pembantu

Seo Young Hee

as Yun Cheong A [Older]

Pemeran Pembantu

Jung Sang Hoon (정상훈)

as [Master]

Pemeran Pembantu

Lee Suk Hyeong

as Jung Bal San [College student]

Pemeran Pembantu

Ahn Do Kyu

as O Ma Ju [Band manager]

Pemeran Pembantu

Yoon Jae Chan

as Kang Hyeon Yul [Bassist]

Pemeran Pembantu

Lee Su Chan

as No Se Beom [Keyboardist]

Pemeran Pembantu

Lee Ha Min

as Lee Si Guk [Drummer]

Pemeran Pembantu

Woo Je Yeon

as On Ji Hwan

Pemeran Pembantu

Han Min

as Bae Su Tak [Spine9’s bassist]

Pemeran Pembantu

Yeon Oh

as Jung Ji O [Spine9’s drummer]

Pemeran Pembantu

Lee So Yeon

as Choi Se Gyeong [Older]

Pemeran Pembantu

Go Doo Shim

as Ko Yang Hui [I Chan’s grandmother]

Pemeran Pembantu

Lee Soo Min

as Yun Sang A [Se Gyeong’s friend]

Pemeran Pembantu

Kim Ye Ji

as Lee Mi Ra

Pemeran Pembantu

Kim Hyung Bum

as O Ma Ju [Older]

Pemeran Pembantu

Shin Hyun Yong

as [PE teacher]

Pemeran Pembantu

Kim Ji Woo

as Ha Eun Ho [Young] (Ep. 1)

Bintang Tamu

Jung Hyun Joon

as Ha Eun Gyeol [Young] (Ep. 1)

Bintang Tamu

Noh Hee Joong

as [Worker] (Ep. 1)

Bintang Tamu

Kim Moon Ho

as [Vegetables supplier] (Ep. 1)

Bintang Tamu

Jeong Yu Jin

as [Cafe staff] (Ep. 1)

Bintang Tamu

Heo Jung Min

as [Coffee shop manager] (Ep. 1)

Bintang Tamu

Kim Ha Eon

as Yeom Byeong Ho (Ep. 1-2)

Bintang Tamu

Kim Mi Hwa

as [Byeong Ho’s mother] (Ep. 1-2)

Bintang Tamu

Kyung Ki Hyun

as [Talent agent] (Ep. 2)

Bintang Tamu

Lee Won Jin

as [Police officer] (Ep. 2)

Bintang Tamu

Shin Young Kyu

as Yong Jun Gi (Ep. 3)

Bintang Tamu

Kim Dong Gyun

as [Math teacher] (Ep. 3)

Bintang Tamu

Lee Seung Chul

as [Unhoused man] (Ep. 3)

Bintang Tamu

Jeon Seok Chan

as [The Day owner] (Ep. 3, 5)

Bintang Tamu

Moon Seo Yeon

as Choi Se Gyeong [Young] (Ep. 4)

Bintang Tamu

Cho Yeo Jun

as Ha Eun Ho [Child] (Ep. 4)

Bintang Tamu

Cha Young Mi

as [Maid] (Ep. 4)

Bintang Tamu

Han Ji Eun

as [Cello instructor] (Ep. 4)

Bintang Tamu

Kwon Dan Ah

as Yun Cheong A [Young] (Ep. 6)

Bintang Tamu

Kim Eui Shin

as [Store owner] (Ep. 6)

Bintang Tamu

Kim Hae Jun

as DJ Jun (Ep. 7)

Bintang Tamu

Ryu Jin

as On Ji Hwan [Adult] (Ep. 7)

Bintang Tamu

Woo Jeong Won

as Yun Sang A [Adult] (Ep. 7)

Bintang Tamu

Lee Sang Hoon

as Attorney Jang (Ep. 8)

Bintang Tamu

Kim So Eun

as Jung Hyun Jung [Nurse] (Ep. 8)

Bintang Tamu

Kim Bong Hui

as [Hospital patient] (Ep. 8)

Bintang Tamu

Yoon Do Hyun

as Yun Dong Jin [Older] (Ep. 10)

Bintang Tamu

Kim Jun Hyung

as Yun Dong Jin [Young] (Ep. 10)

Bintang Tamu

Yoo Yi Ha

as [Cellist student] (Ep. 10)

Bintang Tamu

Lee Moo Nyoung

as [Restaurant worker] (Ep. 10)

Bintang Tamu

Lee Eun Mi

as [Liquor store owner] (Ep. 10)

Bintang Tamu

Hong Suk Youn

as Jung Su Bin (Ep. 11)

Bintang Tamu

Park Woo Young

as Lee Gang Hun (Ep. 11)

Bintang Tamu

Jung Yong Ju

as Jung Do Jin (Ep. 11, 15)

Bintang Tamu

Do Geon Wu

as [Gang member] (Ep. 11)

Bintang Tamu

Lee Dong Gi

as [Gang member] (Ep. 11)

Bintang Tamu

Jin Hui Gyu

as [Incarcerated juvenile] (Ep. 11)

Bintang Tamu

Lee So Hee

as Ji Min (Ep. 13)

Bintang Tamu

Jung Kyu Soo

as Kang Jung Man [Principal] (Ep. 13)

Bintang Tamu

Jeon Jeong Il

as [Taxi driver] (Ep. 13)

Bintang Tamu

Kang Yi Suk

as [Dongwon High student] (Ep. 13)

Bintang Tamu

Byun Gun Woo

as [Convenience store cashier] (Ep. 13)

Bintang Tamu

Moon Hyeon Jeong

as [Maid] (Ep. 14)

Bintang Tamu

Kim So Min

as [Sidewalk boy] (Ep. 15)

Bintang Tamu

Ryu Soo Young

as Lee Si Guk [Older] (Ep. 16)

Bintang Tamu

Zin Tae Hyun

as No Se Bum [Older] (Ep. 16)

Bintang Tamu

Song Chang Eui

as Kang Hyun Yul [Older] (Ep. 16)

Bintang Tamu

Baek Seung Hyun

as [Detective] (Ep. 16)

Bintang Tamu

Yoo Su A

as Ji Hye Su

Bintang Tamu

Kim Ji Yeon

as Da Yeon

Bintang Tamu

Choi Yoon Woo

as Yun Ju Yeop [Young]

Bintang Tamu

Park Jung Hoon

as Lee Jong Gwan [Astronomical department]

Bintang Tamu

Shin Young Chan

as [Boarder]

Bintang Tamu

Yoon Dong Hwan

as [Boarder]

Bintang Tamu

Yoon Jung Hoon

as [Music teacher]

Bintang Tamu

Lee Sae Byul

as [PR team leader]

Bintang Tamu

Jung Kang Hee

as [Club Spark boss]

Bintang Tamu

Park Sun Woo

Bintang Tamu

Kim Hee Sung

Bintang Tamu

Lee Ki Hyuk

Chief Producer

Son Jung Hyun

Sutradara

Park Sang Hyun

Producer

Jin Soo Wan

Screenwriter

Byeon Chang Yeol

as [Middle-aged man]

Bit part